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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62c020038ef8c5c4eafc32187dbd593c01705c5fed2c7670ec7230a27c8f0937' 
  AND token = 'PhgCSM4/9MHj5sZ6JlEteS45I2Z3Xwx54jalf7sfjVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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