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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8bada1e015795f3c6f784bec7b6ebd4ba86b9083bcfefa2ea2999790e01262a' 
  AND token = '6R1xpkpc4FSYXsOW8DgXS5JxcpLe1JQ9hgCqf20eCoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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