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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b745eafb3b88bfc05de30c2fb919c93b5314aeb2f5d0ec221324aaff72e04c5b' 
  AND token = '7zPvPwSkWJpicM8t+QX1RSG8MijoYUfnCUddpVXHVoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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