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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2172547069371dd7c123a6a9c4eb890d97e50966551d5026850299387357211e' 
  AND token = '55AKkAm8nwvD+0q0i+IpWLMXNL9ihbbA1B4dacgri2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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