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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cece260edb57e06552dd875fd201a353eb76eb9078a1da63343cb968984ef70c' 
  AND token = '7scf+QvyaUIkrIzSN/RT3h/eS/e7g5OwO93dKLVHQzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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