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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1023cf98082b496e1d4706660840557b083320c746790b3c14da0a5b32af3290' 
  AND token = 'Fms08lKRz2rgepdg6yH7hB1GILDkuEy1spcX/TywzCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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