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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a2b087d433fc472a1e0a7e846a94d7f9681e46496e10587190c3da7335661dc' 
  AND token = 'iBcr0etRIuylj56YxHboSPflimpF7GFZ1YQXRodRyv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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