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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e3d4cde97b4be16262730631c9d312c80ac2b394a282dc58e6b74cfd7b5e51e' 
  AND token = 'MHdp2xqwJPpVZAmrsQkP+jkbo2r3AWEJiJCIz7ZHCww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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