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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ad5dfec2b91878364cdf780fe8ba11b1c0c705d24147f54d70ee6cf2649a63b' 
  AND token = 'wFPx7qKYHnPcYIHv9AccOY49WRD/EM7mujEF878rEXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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