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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5e7f74b260cf1997ed28ec2af06b55641a0950ea3844317e058aa94cd9de1ca' 
  AND token = 'OGOxoHv7R8NXMOSk4S3KOlfoCPiTvPEIlKfWSAleKI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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