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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c4356100f45ba097f7aea67b75cea9bad8beedf2276e0999e0ff21a40b59628' 
  AND token = 'M5e06DspvkMm3/cUJ2iVAcMXyhipF7iXrs0S0PtCmfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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