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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d8e4b8a37cfe2bdae015ea43197aa2e2f1432466af8c744a188d02a510fbcd6' 
  AND token = 'J33AETCc8j2t8euJ0e1jV99ftyAOqK6MV4dYY83wyss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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