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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4ea4234b8261c2c4f4b4f471b7adef91cf69ea03451e6c424e21f7125e6c49b' 
  AND token = 'bK9rB4qNLDtk+MHCoyhWwrbmsc5NCvBwGrmCeBfyeOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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