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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfffa595e7e8187a6553054f32b1602e6a253e74bdce7463e8b1f8965166e9be' 
  AND token = '1c9Emxki6k/U24t3WGRJjmkPwaflbW3iOo/Or2O+5hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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