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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be5163c0594ef52e74675a61b1c126acabd7292e5a0320b6f9060a52fce508ca' 
  AND token = '9Z504u6sqxOPWCNFBSY8Gc8xLUHI/wL1uMWBfIrbdA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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