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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '252699a46107568e3dd80a5639915ff47131c2071a97ba0200d248b1674341aa' 
  AND token = 'G1Q5WcObelq9vuotIc1fTLsHxSxIE3F+dcIOXRKa9+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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