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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e2eed8b551a4368232dd3ed013e1d97ac6a5ff49b51f29039295fe518448d73' 
  AND token = 'ACi8kA30SuG1OWL5Nb+ZfJeQrbHdHfJnuSLxWZVBu4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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