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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef797bbe76e0f4299dd9c2d68ac2979408acdcc008ec1925f391d56f0011bb55' 
  AND token = 'VObeP7jjs5F4d4x+IoMHxPqcVZuomCe3RSc6mQ685Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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