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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b6ea479708066ad6ff458af7f930b87ce955a0b17e35470a8cd319d5de4ce2a' 
  AND token = '0AvoeTZWvSFjAdkIMuCV9uumTjR8rmr4y1Vpkq9/XCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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