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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29f66229e776ca67767c9907fe0b67deda81cc2a23680e6bd1d41c9039aec8a7' 
  AND token = 'ju97iXdSTBJynPmO7ixi8RxF5LW21uPfXbuneq1d33Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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