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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fca124fd6ee1142ef9bfcc6d1e8f45ad62a7fc09e9b70fcaa655cb8535b4c73' 
  AND token = 'kbZ3gj3wjdR+IV0teCDfqnM8Rd7gL+RSVdm/qEop9IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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