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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd191fb0498e2f48c6ee46c6e58a920bf391c88807c2e1f87f359abb09180aa05' 
  AND token = '391oFWG3vUkyVfLULjKC38ejEtUbyGOitBN4DhoSGf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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