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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a0e68d8d3c96b928f6cd17eadf97e771f5e8900c1e3bf12fefcd644b077b3d3' 
  AND token = 'wz0aSOrLXjejb94H3S1BjvDn2HZxjsTw0yzT3aSzb4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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