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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffc138c324a81beee05119abab35236874c4fdd68e1d84ca87ed7378c804d483' 
  AND token = 'AMc/Xzqh2XIxANt4dxFvwEy9wjZV3qSkKPct9ji4jcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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