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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9afec091c49c23ac3b29dc9d159c9a527c28564e7fec59bd8abdec0b8bd784ff' 
  AND token = 'PjjtOFRSArlq58mEp8DSf0k2Cn5om/DnBoMnsOh2Hh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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