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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e69b3aa417c0c914977974ee993936d9c2fdeaaa911d119c2775b082629d931e' 
  AND token = 'QU2ihciDI2j1S++bQ6IoDAaoSgpyDW632T0e0raAf2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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