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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ef4064770027ef02dc207b2a6871c7ffaf21dd70d74c5b48cdd1788f7dfa737' 
  AND token = 'yTJ2y3zJRTmVhSnnLwlWXI9tWHsTChe7gTSzw/39Sbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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