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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e077ef08dd72faaae1fe1398d14a44c23e28ebf74ba93d13815aedd931d49ed1' 
  AND token = 'Padhv6OTdse9rsmhXrziOqXcjKMhg6ib5qxYBkkpGUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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