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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '487de296e40e6db752c6f06e4ed9c73c7dd2ea420d0c9ea00a74c3ee02a884a7' 
  AND token = '+/xLzba1ZA3R/UU/8ISi19x1n7tKKKGucEd9SD2PiCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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