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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74e45b83c198ef2ff23d64d6c9cf65a6e9e3b74a7870b234c3d03e5414bb8a75' 
  AND token = 'FZ3berZyFj9M+VV7fmLVLUfblk8uc9angFBHj87Z7wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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