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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08fddd5cf54892de0f0f9353a59a99851b0c5daea562479864843ee911b9488e' 
  AND token = 'HpKzx5SykSvDYzO9Sr848AIAInN58FRV58Wu07WympU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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