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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56b7a734323001acd811ce05d038d1ee0f84b4fe014cdddc549d36322b74c525' 
  AND token = 'Uh4M2XAVzoMRdJM5KfzOOHw5bx76pxwL2vCiRqmpOPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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