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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7f09c93ddf4b84c1bb2a0339249467ef0178810efb018ad726b8ee1f76ade78' 
  AND token = 't7TZjlL+xh0uPPPYIKRtSd7Pt1jt3Ar9D/srPt+wzBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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