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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b6f25d0233eb7abd467fa4a7574e48f5c58bc74955e85bc6aa2996051361aa2' 
  AND token = 'oaXJU0lBbU3uxrnQn+JSlIcrM1O3kaQwwynBz2U2HfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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