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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca9b77affe32df4ef6822f272b10afd7067aa2343fe62cb2ad35edb16bc18018' 
  AND token = 'v057KmK+NfIRSow35043/2AbS+aQ1oSt3gXeLPd74tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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