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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40da9cffa602dab6685d24ed8cac5ec5810b96f380150ca6e58a5fd18e2540eb' 
  AND token = 'WRpuazydzZjBvt0OW79xG88feVX9QL3dNAc0L4/5ckM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}