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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abd6ca0e9de384f7f7f18c5225565aff602b0f74efaa80fd210e8dd55d5fa0e3' 
  AND token = 'uFZZHRgfgfpDCzYoe3esrL3sQNGKp3i/2r+DExTRCc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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