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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46cc4350c4082e599c1fe22191a3643c469b27f35c21b5a2ca2efdc89ff55d97' 
  AND token = 'H+2iZ1eEHeTLAlrszwoq3rsZ4rKw3BU0SFRW6Eufb0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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