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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8719500fada5505cd4d61a427902b3319bbf2e026f71c3d6268bac20d8a54a68' 
  AND token = 'gLdnF3xo3ug3D09myk/mayOexdlX8A7IeRTkSsaUgrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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