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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '929a2ec2032ab005b139b3d949c6b1c9304bdaeacec825068ae7d7e7cd3b19e5' 
  AND token = 'FYwKrDWHngxycrE7oxmfq4V0jeea0sJEelD2QEHNhm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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