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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbcbe1039ed8b457b2f1a661a1fbb0aed4e0ef37063b84217ba341f542051363' 
  AND token = 'ZeFthKpzMLvBAeNa2vtO1wyl6+9F5Irt/c0Et8OFCDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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