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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c99d9cb47ce282a9ebb6f30d8c2b2c9ed2fe220bf32da1c26de9dc73c329e9a2' 
  AND token = 'QmFl+WZjCgvSfe7eqiiomj9eynz3hLCM1ENtc3r91R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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