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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca3c0242d23674f233d773ee9fd8dd599171c862ffc81d872df6cbf4e65bd339' 
  AND token = 'D9qjDmCNKpP836Vo6zROGjAsti7t+mZIdYaXM1ncSCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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