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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0a2cb07cfd9d3a33bbc7f216389f2714686d01ba8b3690239caf4a6a14b54f6' 
  AND token = 'i6Hga67NcY9UpvACw+SDGWCVACvuH7L6wAM8qr20H9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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