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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03230c834c11da2d73e0da57b8001087c02a884b5413b6f29c5ecc6ad99bdce9' 
  AND token = 'H0f+6+miN7TEFmCENik0ToqqG2/eAZJm7WvUJ0paljE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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