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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bdaeb0e71f69c112fe378cc435fe7f38254386163117291b1236050359a018b' 
  AND token = 'y59smYjcCpqcCHpnOCJQ3ZKXp6KMnWqCjmCG7Xucjpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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