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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e337e978bf8b814226b4662db0bf49b95365879a1c0ed83e86c8729566613d8' 
  AND token = 'rd8+A4c3D1PRmJuQ7fdOASw3+izkmzyOT02oYbTq0W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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