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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b95c09c8287f91e0ac753921ca2b0d3a70d4a97e7731966cb2e9486205563e1' 
  AND token = 'yT2gqiMOWuA4Li0h0pP/ebhYJTogX7zrtsXyIxbb2Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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