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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb8d74a15b0614f296ac7f4e2f6c9c2ec25e2558e6c35e69919695ea255734f2' 
  AND token = 'oEXpUWpKjIZINm/BwurRYSIzoSST3qS7/4Prf1tMtKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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