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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '582820c19e24d259027df578f6310be4a59ecbe2d2a53b3cecb28b410da266df' 
  AND token = 'M7nc0Bry7ukI8Jm6y/ZiAh4RDWIazsBeNm02+hYiTC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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